Loading...
Search for:
road-surface-roughness
0.005 seconds
Investigation of Moving Oscillator’s Critical Speed on Single-Span Bridge with Roadway Roughness by FEM
, M.Sc. Thesis Sharif University of Technology ; Vafai, Abolhassan (Supervisor) ; Mofid, Masoud (Co-Advisor)
Abstract
In this research the critical speed of a moving oscillator on a single-span bridge with different support (boundary) conditions and by considering the presence of road surface roughness surface with finite element perspective is studied. Due to the fact that passing a moving load on top of the beam causes increased maximum stress and deformations in beam compared to static situation, therefore in reputable codes for bridge design such as AASHTO a dynamic amplification factor is used for designing bridge components. Moving oscillator is a more precise model compared to moving mass for modeling vehicles and the suspension system is modeled as a spring and damper and the moving mass is...
Bayesian Modeling of Road Surface Roughness Characteristics for Fatigue Damage Assessment
, M.Sc. Thesis Sharif University of Technology ; Adibnazari, Saeed (Supervisor) ; Shariyat, Mohammad (Supervisor)
Abstract
Road roughness-induced vibrations are the main source of fatigue damage accumulation in vehicles. Hence, road surface profile modeling and simulation are of high importance when it comes to vehicle fatigue damage assessment. This research focuses on uncovering the statistical distributions that describe the characteristics of road loads that affect fatigue damage accumulation. Particle filtering is deployed to estimate the log-volatility of the road surface profile by assuming a random walk behavior for the hidden log-volatility. The skew-normal distribution with three parameters is fitted to the estimated log-volatility. The inferred parameters are used for synthesizing artificial road...